Composite pipeline lined with ultra-high performance concrete layer and construction method of composite pipeline

Abstract

The invention relates to a composite pipeline lined with an ultra-high-performance concrete layer and a construction method of the composite pipeline. The composite pipeline comprises a concrete pipeline and an ultra-high-performance concrete pipeline located on the inner layer of the concrete pipeline. The concrete pipeline is prepared from a cement-based material. The ultra-high performance concrete pipeline is prepared from an ultra-high performance concrete material. Compared with the prior art, the impact resistance and corrosion resistance of the pipeline wall can be effectively improved under the conditions of low cost and simple process, the durability of the pipeline is enhanced, and the service life of the pipeline is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a composite pipeline lined with an ultra-high performance concrete layer and a construction method thereof. Background Art

[0002] Concrete material is a widely used material in the field of civil engineering. It has high compressive strength and low tensile strength, simple process, low price and wide application. Ordinary concrete is a mixture of cement, aggregate and water in appropriate proportions. The particle size of coarse aggregate is greater than 4.75mm. Based on the theory of bonding and coarse aggregate strength, the strength grade of ordinary concrete generally does not exceed C80. Ordinary concrete pipes have poor durability against the impact of water flow, especially against the corrosion of sewage, due to their own materials, so that urban sewage pipes need to be reinforced after several years of use. The existing measures are to use PVC (polyvinyl chloride), PE (polyethylene), GRC (glass fiber) and other materials to line the inner wall of the concrete pipe to resist corrosion, but this type of composite pipe is relatively expensive, not resistant to high temperatures, easy to age and easy to break.

[0003] Ultra-high performance concrete is a new type of material developed based on the maximum packing density theory. It has extremely high tensile and compressive strength and excellent corrosion resistance, but it is expensive, the process is complicated, and its application is limited, so it is not widely used. In view of the high price and complex process of ultra-high performance concrete, and the insufficient performance of conventional concrete materials, the present invention proposes a composite pipe of ordinary concrete and ultra-high performance concrete to solve the above problems. The culvert itself has excellent corrosion resistance, which can reduce maintenance costs and extend service life.

[0004] Patent Publication No. CN111703135A discloses a fiber-reinforced multi-performance composite pipe, which includes an inner layer blank pipe, a reinforcement mesh, and an outer protective layer. The wire mesh is contained in the adhesive between the inner layer blank pipe and the outer protective layer, and the composite pipe contains reinforced short fibers. Patent Announcement No. CN219221514U discloses a FRP-concrete-steel double-wall hollow composite pipe, which is prefabricated in sections along the length direction, and adjacent pipe section units are connected to form a pipe through nodes. The pipe section unit includes an internal first steel pipe, an external FRP pipe, and a sandwich concrete filled between the first steel pipe and the FRP pipe. However, the production process of the above two composite pipes is complicated and is only suitable for small-diameter pipes, and it is difficult to use them for large-diameter pipes. Patent Announcement No. CN208185650U discloses a UHPC-SS composite pipe, including a stainless steel pipe, a UHPC concrete layer is cast on the outside of the stainless steel pipe, and a steel mesh is provided in the UHPC concrete layer. However, the production cost of the composite pipe is relatively high. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a composite pipe lined with an ultra-high performance concrete layer and a construction method thereof, which can effectively improve the impact resistance and corrosion resistance of the pipe wall, enhance the durability of the pipe, and extend the service life of the pipe under low cost and simple process conditions.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A composite pipe lined with an ultra-high performance concrete layer, the composite pipe comprising a concrete pipe and an ultra-high performance concrete pipe located in the inner layer;

[0008] The concrete pipe is prepared by using cement-based materials;

[0009] The ultra-high performance concrete pipe is prepared by using ultra-high performance concrete material.

[0010] Furthermore, the wall thickness of the composite pipe is H, the wall thickness of the concrete pipe is h1, and the wall thickness of the ultra-high performance concrete pipe is h2, and h1, h2, and H meet the following conditions:

[0011] H=h1+h2 (1)

[0012] 1.0cm< h2 <0.6H (2).

[0013] Furthermore, the wall thickness H of the composite pipe is 0.03-0.6 m, the wall thickness h1 of the concrete pipe is 0.02-0.59 m, and the wall thickness h2 of the ultra-high performance concrete pipe is 0.01-0.36 m.

[0014] The wall thickness h1 of the concrete pipe and the wall thickness h2 of the ultra-high performance concrete pipe can be provided with steel bars.

[0015] Furthermore, the cross section of the composite pipe is circular or rectangular.

[0016] Furthermore, when the cross section of the composite pipe is circular, the inner diameter of the composite pipe is 0.2 to 6 m, and the outer diameter is 0.26 to 7.2 m.

[0017] Furthermore, when the cross section of the composite pipe is rectangular, the length of the inner rectangle is 0.2 to 6 m and the width is 0.2 to 6 m, and the length of the outer rectangle is 0.26 to 7.2 m and the width is 0.26 to 7.2 m.

[0018] Furthermore, the composite pipe is a segmented prefabricated pipe, and the segment length is 0.5 to 20 m.

[0019] Furthermore, the connection methods of the composite pipes of different sections include socket-and-spigot filler sealing connection, socket-and-spigot rubber ring sealing connection, and flat-end sleeve ring sealing connection.

[0020] Furthermore, the contact surface between the concrete pipe and the ultra-high performance concrete pipe is a rough surface or a concave-convex surface.

[0021] Furthermore, the strength grade of the concrete pipe does not exceed C80; ultra-high performance concrete material is a concrete material with ultra-high strength, high toughness and excellent durability through optimized material ratio and microstructure design. Generally, its cubic compressive strength is greater than 100MPa and its flexural strength is greater than 12MPa.

[0022] Furthermore, the high-performance concrete is produced from active powder materials such as cement and mineral admixtures, fine aggregate, water, admixtures, aggregates and other raw materials, and is a cement-based composite material with ultra-high mechanical properties and ultra-high durability.

[0023] Furthermore, the ultra-high performance concrete may also be added with high-strength fine steel fibers and / or organic synthetic fibers.

[0024] A construction method for a composite pipe lined with an ultra-high performance concrete layer, the method comprising the following steps:

[0025] S1. Prepare raw materials of cement-based materials and ultra-high performance concrete materials, and stir and mix them to obtain cement-based materials and ultra-high performance concrete materials;

[0026] S2, preparing an inner layer ultra-high performance concrete pipe mold and an outer layer concrete pipe mold;

[0027] S4: pouring the mixed cement-based material into the outer concrete pipe mold to obtain a concrete pipe;

[0028] S3: injecting the mixed ultra-high performance concrete material between the concrete pipe and the inner ultra-high performance concrete pipe mold to obtain an ultra-high performance concrete pipe layer;

[0029] S5: After pouring, curing and demoulding are performed to obtain a composite pipe.

[0030] Furthermore, the mixing process of cement-based materials and ultra-high performance concrete adopts conventional means in the art.

[0031] Furthermore, the ultra-high performance concrete pipe mold and the concrete pipe mold are selected according to size as a centrifugal molding mold, a vertical vibration mold, a core mold vibration mold, a vertical extrusion mold or other molds.

[0032] Furthermore, in order to prevent concrete from sticking, the ultra-high performance concrete pipe mold and the concrete pipe mold are cleaned and coated with a release agent.

[0033] Furthermore, the maintenance is carried out by natural watering or steam maintenance.

[0034] Furthermore, the construction time interval between the concrete pipe and the ultra-high performance concrete pipe is no more than 1000 days.

[0035] Furthermore, a rough surface or a concave-convex surface is formed on the contact surface of the concrete pipe and the ultra-high performance concrete pipe by natural demoulding, sandblasting, mechanical grinding, brushing a rough coating, etc.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] (1) The composite pipe of the present invention places the concrete pipe in the outer ring to withstand tensile stress and compressive stress; the ultra-high performance concrete pipe is placed in the inner ring to resist corrosion and impact of gas and liquid in the pipe; thereby improving the impact resistance and corrosion resistance of the composite pipe wall, enhancing the durability of the composite pipe, and extending the service life of the composite pipe.

[0038] (2) The composite pipe of the present invention reduces the maintenance cost during the service life of the pipe with less additional cost, thereby reducing the overall project cost and reducing the manufacturing cost of the composite pipe, which is conducive to actual industrial application.

[0039] (3) The composite pipe of the present invention places ultra-high performance concrete on the inner side of the concrete pipe. Compared with conventional linings of materials such as PVC, PE, and GRC, its preparation is simpler, its applicability is wider, its cost is lower, its connection is more secure, and its corrosion resistance is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a cross-sectional view of the composite pipe shown in Example 1;

[0041] Figure 2 This is a cross-sectional view of the composite pipe shown in Example 2.

[0042] Description of the markings in the figure:

[0043] 1-Concrete pipe, 2-Ultra-high performance concrete pipe. DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments. Based on the given embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0045] Unless otherwise specified, the reagents, methods, instruments and equipment used in the present invention are conventional reagents, methods, instruments and equipment in the art.

[0046] Example 1

[0047] A composite pipe lined with an ultra-high performance concrete layer, such as Figure 1 As shown, the composite pipe includes a concrete pipe 1 and an ultra-high performance concrete pipe 2 located in the inner layer thereof;

[0048] The concrete pipe 1 is made of cement-based materials;

[0049] The ultra-high performance concrete pipe 2 is made of ultra-high performance concrete material.

[0050] In this embodiment, the wall thickness of the composite pipe is H, the wall thickness of the concrete pipe 1 is h1, and the wall thickness of the ultra-high performance concrete pipe 2 is h2. h1, h2, and H meet the following conditions:

[0051] H=h1+h2 (1)

[0052] 1.0cm< h2 <0.6H (2).

[0053] In this embodiment, the wall thickness H of the composite pipe is 0.3 m, the wall thickness h1 of the concrete pipe 1 is 0.25 m, and the wall thickness h2 of the ultra-high performance concrete pipe 2 is 0.05 m.

[0054] In this embodiment, the cross section of the composite pipe is circular, the inner diameter of the composite pipe is 3 m, and the outer diameter is 3.6 m;

[0055] In this embodiment, the composite pipe is a segmented prefabricated pipe, and the segment length is 5m.

[0056] In this embodiment, the connection method of the composite pipes of different sections is a socket-and-spigot packing sealing connection.

[0057] In this embodiment, the contact surface between the concrete pipe 1 and the ultra-high performance concrete pipe 2 is a rough surface, and the rough surface is wavy.

[0058] In this embodiment, the strength grade of the concrete pipe is C50; the ultra-high performance concrete UC180 has a cubic compressive strength of 180 MPa and a flexural strength of 27 MPa.

[0059] In this embodiment, the high performance concrete material is made of the following components in terms of mass fractions, and the mix ratio is as follows: the mass ratio of cement, sand, water, water reducing agent, silica fume, and steel fiber is 967:675:230:15:150:224.

[0060] In this embodiment, the cement is Conch Brand 425 ordinary cement produced by Shanghai Fengxian Cement Plant.

[0061] In this embodiment, the silica fume is high-quality medium-micro silica fume produced by Elkem International Trading Shanghai Co., Ltd., which is dark gray and amorphous, has a SiO2 content of more than 95%, and a specific surface area of ​​15000m 2 / kg.

[0062] In this embodiment, the sand is Chinese ISO standard sand produced by Xiamen Ace Standard Sand Co., Ltd., and the silicon dioxide content is not less than 96%.

[0063] In this embodiment, the water is clean tap water.

[0064] In this embodiment, the steel fiber is OL 13 / .20 Jamix steel fiber produced by Shanghai Bell Carter Second Steel Company, with a diameter of 0.12 mm, a length of 5 mm, and an aspect ratio of 40; elastic modulus: 210 GPa; tensile strength: 2600 MPa; density: 7.8 g / cm 3 . To prevent rust, its surface is copper-plated.

[0065] In this embodiment, the water reducer is a BASF polycarboxylate high-efficiency water reducer provided by Shanghai Master Construction, a joint venture between Shanghai Construction and BASF. The liquid color is orange-yellow, the solid content is 40%, and the water reduction rate is greater than 30%.

[0066] A construction method for a composite pipe lined with an ultra-high performance concrete layer, the construction method comprising the following steps:

[0067] S1. Prepare raw materials of cement-based materials and ultra-high performance concrete materials, and stir and mix them to obtain cement-based materials and ultra-high performance concrete materials;

[0068] S2, preparing an inner layer ultra-high performance concrete pipe mold and an outer layer concrete pipe mold;

[0069] S4: pouring the mixed cement-based material into the outer concrete pipe mold to obtain a concrete pipe 1;

[0070] S3: injecting the mixed ultra-high performance concrete material into the concrete pipe 1 and between the inner ultra-high performance concrete pipe mold to obtain an ultra-high performance concrete pipe layer 2;

[0071] S5: After pouring, curing and demoulding are performed to obtain a composite pipe.

[0072] In this embodiment, the cement-based material is stirred and mixed using conventional methods in the art.

[0073] In this embodiment, the ultra-high performance concrete material contains reinforcing fibers (steel fibers in this embodiment), and the mixing process is as follows: first, pour 1 / 3 of the sand and steel fibers into a mixer, add the remaining sand to cover the steel fibers, and dry mix for 4 minutes; add cement and silica fume, continue dry mixing for 4 minutes, add a water reducer and water, and stir for 6 minutes.

[0074] In this embodiment, the ordinary concrete pipe mold is a vertical vibration mold, and the inner mold thereof has wavy concave-convex patterns with a depth of 3 mm, and the ultra-high performance concrete pipe mold is a vertical vibration mold.

[0075] In this embodiment, in order to prevent concrete from sticking, the ultra-high performance concrete pipe mold and the concrete pipe mold are cleaned and coated with a release agent.

[0076] In this embodiment, the maintenance is carried out by natural maintenance by sprinkling water.

[0077] In this embodiment, the construction time interval between the concrete pipe 1 and the ultra-high performance concrete pipe 2 is no more than 30 minutes.

[0078] In this embodiment, after the inner mold of the concrete pipe 1 is removed, a wavy concave-convex surface is naturally formed.

[0079] Example 2

[0080] Compared with Example 1, most of them are the same, except that the cross section of the composite pipe is rectangular, the inner rectangle is 3m long and 4m wide, and the outer rectangle is 4m long and 5m wide. Figure 2 shown.

[0081] Although the present invention has been described in detail above by means of general description, specific implementation methods and tests, it is obvious to those skilled in the art that some modifications or improvements may be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A composite pipe lined with an ultra-high performance concrete layer, characterized in that: The composite pipe comprises a concrete pipe (1) and an ultra-high performance concrete pipe (2) located in the inner layer thereof; The concrete pipe (1) is prepared using cement-based materials; The ultra-high performance concrete pipe (2) is made of ultra-high performance concrete material.

2. The composite pipe lined with an ultra-high performance concrete layer according to claim 1, characterized in that: The wall thickness of the composite pipe is H, the wall thickness of the concrete pipe (1) is h1, and the wall thickness of the ultra-high performance concrete pipe (2) is h2. h1, h2, and H satisfy the following conditions: H=h1+h2 (1) 1.0cm< h2 <0.6H (2).

3. The composite pipe lined with an ultra-high performance concrete layer according to claim 1, characterized in that: The wall thickness H of the composite pipe is 0.03 to 0.6 m, the wall thickness h1 of the concrete pipe (1) is 0.02 to 0.59 m, and the wall thickness h2 of the ultra-high performance concrete pipe (2) is 0.01 to 0.36 m.

4. The composite pipe lined with an ultra-high performance concrete layer according to claim 1, characterized in that: The cross section of the composite pipe is circular or rectangular.

5. The composite pipe lined with an ultra-high performance concrete layer according to claim 4, characterized in that: When the cross section of the composite pipe is circular, the inner diameter of the composite pipe is 0.2 to 6 m, and the outer diameter is 0.26 to 7.2 m.

6. The composite pipe lined with an ultra-high performance concrete layer according to claim 4, characterized in that: When the cross section of the composite pipe is rectangular, the length of the inner rectangle is 0.2-6 m and the width is 0.2-6 m, and the length of the outer rectangle is 0.26-7.2 m and the width is 0.26-7.2 m.

7. The composite pipe lined with an ultra-high performance concrete layer according to claim 1, characterized in that: The composite pipe is a segmented prefabricated pipe, and the length of the composite pipe segment is 0.5 to 20 m.

8. The composite pipe lined with an ultra-high performance concrete layer according to claim 7, characterized in that: The connection methods of composite pipes of different sections include socket-and-spigot filler sealing connection, socket-and-spigot rubber ring sealing connection, and flat-end sleeve ring sealing connection.

9. The composite pipe lined with an ultra-high performance concrete layer according to claim 1, characterized in that: The contact surfaces of the concrete pipe (1) and the ultra-high performance concrete pipe (2) are rough surfaces or concave-convex surfaces.

10. A construction method for a composite pipe lined with an ultra-high performance concrete layer according to any one of claims 1 to 9, characterized in that: The construction method includes the following steps: S1. Prepare raw materials of cement-based materials and ultra-high performance concrete materials, and stir and mix them to obtain cement-based materials and ultra-high performance concrete materials; S2, preparing an inner layer ultra-high performance concrete pipe mold and an outer layer concrete pipe mold; S4: pouring the mixed cement-based material into the outer concrete pipe mold to obtain a concrete pipe (1); S3: injecting the mixed ultra-high performance concrete material into the concrete pipe (1) and between the inner ultra-high performance concrete pipe mold to obtain an ultra-high performance concrete pipe layer (2); S5: After pouring, curing and demoulding are performed to obtain a composite pipe.

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